/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.room.writer

import androidx.room.compiler.codegen.VisibilityModifier
import androidx.room.compiler.codegen.XFunSpec
import androidx.room.compiler.codegen.XTypeName
import androidx.room.compiler.codegen.XTypeSpec
import androidx.room.ext.CommonTypeNames
import androidx.room.ext.RoomTypeNames
import androidx.room.ext.SQLiteDriverTypeNames
import androidx.room.ext.SupportDbTypeNames
import androidx.room.solver.CodeGenScope
import androidx.room.vo.FieldWithIndex
import androidx.room.vo.Fields
import androidx.room.vo.ShortcutEntity

class EntityDeleteAdapterWriter
private constructor(val tableName: String, val pojoTypeName: XTypeName, val fields: Fields) {
    companion object {
        fun create(entity: ShortcutEntity): EntityDeleteAdapterWriter {
            val fieldsToUse =
                if (entity.isPartialEntity) {
                    // When using partial entity, delete by values in pojo
                    entity.pojo.fields
                } else {
                    // When using entity, delete by primary key
                    entity.primaryKey.fields
                }
            return EntityDeleteAdapterWriter(
                tableName = entity.tableName,
                pojoTypeName = entity.pojo.typeName,
                fields = fieldsToUse
            )
        }
    }

    fun createAnonymous(typeWriter: TypeWriter, dbParam: String, useDriverApi: Boolean): XTypeSpec {
        return if (useDriverApi) {
                XTypeSpec.anonymousClassBuilder()
            } else {
                XTypeSpec.anonymousClassBuilder("%L", dbParam)
            }
            .apply {
                superclass(
                    if (useDriverApi) {
                            RoomTypeNames.DELETE_OR_UPDATE_ADAPTER
                        } else {
                            RoomTypeNames.DELETE_OR_UPDATE_ADAPTER_COMPAT
                        }
                        .parametrizedBy(pojoTypeName)
                )
                addFunction(
                    XFunSpec.builder(
                            name = "createQuery",
                            visibility = VisibilityModifier.PROTECTED,
                            isOverride = true
                        )
                        .apply {
                            returns(CommonTypeNames.STRING)
                            val query =
                                "DELETE FROM `$tableName` WHERE " +
                                    fields.columnNames.joinToString(" AND ") { "`$it` = ?" }
                            addStatement("return %S", query)
                        }
                        .build()
                )
                addFunction(
                    XFunSpec.builder(
                            name = "bind",
                            visibility = VisibilityModifier.PROTECTED,
                            isOverride = true
                        )
                        .apply {
                            val stmtParam = "statement"
                            addParameter(
                                stmtParam,
                                if (useDriverApi) {
                                    SQLiteDriverTypeNames.STATEMENT
                                } else {
                                    SupportDbTypeNames.SQLITE_STMT
                                }
                            )
                            val entityParam = "entity"
                            addParameter(entityParam, pojoTypeName)
                            val mapped = FieldWithIndex.byOrder(fields)
                            val bindScope =
                                CodeGenScope(writer = typeWriter, useDriverApi = useDriverApi)
                            FieldReadWriteWriter.bindToStatement(
                                ownerVar = entityParam,
                                stmtParamVar = stmtParam,
                                fieldsWithIndices = mapped,
                                scope = bindScope
                            )
                            addCode(bindScope.generate())
                        }
                        .build()
                )
            }
            .build()
    }
}
